Down load here my article pdf file (for personal use only)
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CLICK BELOW - ON COVER - TO ENTER THE PROJECT RESOURCES INFOS, PHOTOS AND MORE
QEX first Cover about my article published in March-April 2003 issue.
Title: A High-Level Accessory Front End for the HF Amateur Bands (pages 45 to 56)
(with ARRL permission and copyright by Sergio Cartoceti, IK4AUY, 2003. This material originally appeared in
QEX: Forum for Communications Experimenters)
if you are a licensed amateur radio and you are interested to get a copy
you can download from this page a .pdf file (about 1 Mb) or ask for a copy to ARRL-QEX Editor-
for personal use and amateur radio interest only.
push-pull preamplifier schematic alone has been included
by John Delvoldere, ON4UN
in Low - Band DXing (Fourth Edition) by ARRL
ERRATA CORRIGE: in this schematic there is a printing error
the emitter resistor to ground in each 2N5109 should be 100 Ohm
(not the wrong value shown of 560 Ohm)
My QEX article is correct.
The text article in the book at page 7-98 and 7-99 is indeed 100%
correct so with 100 Ohm emitter resistor each transistor is biased
for about 50 to 60 mA (so for 2 X 2N5109 a total current of
around 100 mA at 12V DC or about 115mA at 13.8VDC.
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Last update: Nov 22, 2009